JP2827270B2 - Earth station controller switching method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a failure of an earth station control device (hereinafter, referred to as SAC) in a satellite communication network, and more particularly, to recovering from a network failure in a short time, The present invention relates to a high-speed SAC switching method for improving work reliability.

(Prior Art) Conventionally, when switching from an active SAC to a standby SAC, a network monitoring device (hereinafter, referred to as an SNCP) transmits the standby SAC.
In this case, a communication control device (hereinafter, referred to as a CCU) is down-line loading a program of the protocol, that is, a program of the protocol which is currently used. Therefore, the switching of the SAC has not been completed until the downline loading is completed by the number corresponding to the number of the communication control devices. For this reason, at the time of SAC failure, the network had been a failure for as long as about 20 minutes.

(Problem to be Solved by the Invention) The above-mentioned conventional standby SAC switching method is a method of performing down-line loading from SNCP via a line, so that a network failure is extended for a long time. There are drawbacks.

An object of the present invention is to perform down-line loading of programs of all protocols in the memory of the spare SAC in advance, and when switching the spare SAC, the main processor unit of the SAC is stacked in the memory by a program load instruction from the SNCP. An object of the present invention is to provide a SAC switching system configured to eliminate the above-mentioned drawbacks by selecting a program to be loaded and loading a program of a corresponding protocol into a CCU, and to speed up downline loading.

(Means for Solving the Problems) A SAC switching method according to the present invention comprises a working and protection SAC for controlling a satellite with a memory and a CCU, a line switch for switching the working and protection SAC, and a line switch. It comprises an SNCP for controlling a switch and a plurality of host computers for providing a protocol.

In the above configuration, the SNCP includes standard down-line loading means for down-loading all protocol programs in advance to the spare SAC and storing them in memory, and means for instructing down-line loading when switching to the spare SAC. And an inter-processor down-line loading means for loading a protocol program from a memory to a CCU in response to a down-line loading instruction.

(Example) Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the SAC switching system according to the present invention.

In FIG. 1, reference numerals 11 and 12 denote host computers, reference numerals 21 and 22 denote signal lines for transmitting a protocol, reference numeral 3 denotes a line switch, reference numeral 4 denotes an SNCP, reference numerals 51 and 52 denote active SACs, reference numeral 53 denotes a spare SAC, reference numeral 6 denotes a satellite, 71 and 72 are small earth stations for satellite communication (referred to as VSAT). In current RACs 51 and 52,
511 and 521 are CCUs. In the spare SAC 53, reference numeral 531 denotes a CCU, reference numeral 532 denotes an MPU, and reference numeral 533 denotes a memory for storing protocols A and B.

First, the SNCP 4 performs the down-line loading of the program of all protocols to the backup SAC 53, and performs the down-line loading of the program of the corresponding protocol to the active SACs 51 and 52. This is called standard down line loading.

Next, when SNCP4 detects a failure in the working SACs 51 and 52, the SNC
P4 switches the line switch 3 and instructs the standby SAC53 to execute downline loading. When the standby SAC53 receives the instruction of the down-line loading, the SNCP4 transmits the program of the corresponding protocol from the memory 533 of the MPU 532 to the CCU53.
Perform the operation of downline loading to 1. This is called inter-processor downline loading by the secondary program loader.

When the downline loading between processors is completed,
The backup SAC 53 notifies the SNCP 4 of the completion of the down-line loading between the processors, and becomes the active SAC.

(Effects of the Invention) As described above, according to the present invention, the SAC switching can be realized at high speed within 80 seconds by performing the preliminary SAC switching by the down-line loading method by the secondary program loader, and the network reliability is improved. There is an effect that can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the earth station controller switching system according to the present invention. FIG. 2 is an explanatory diagram showing a downline loading sequence of the secondary program loader. 11,12 Host computer 21,22 Signal line 3 Line switch 4 Network monitoring device (SNCP) 51-53 Earth station controller (SAC) 511,521,531 Communication controller (CCU) 532 …… MPU 533 …… Memory 6 …… Satellite 71,72 …… Small Earth Station for Satellite Communication (VSAT)

Claims (1)

(57) [Claims] 1. An active and standby earth station controller having a memory and a communication controller for controlling satellites, a line switch for switching between the active and standby earth station controllers, and controlling the line switch. And a plurality of host computers for providing a protocol, the network monitoring device switching system comprising: Standard down-line loading means for down-loading to the earth station controller and storing it in the memory, means for instructing the down-line loading when switching to the spare earth station controller, and the down-line loading The program of the protocol is stored in the memory Earth station controller switching system characterized by being configured by including a downline Rohde queuing means between processors to load to the communication control device.